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Phase Sequence Detector

Z

Zouie

Jan 1, 1970
0
Could Someone inform, or point me to a site that describes the circuit or
the operation of a Phase Sequence Detector? I need to create a tools that
can detect phase sequense in 3 phase....
Pls , I need an idea....

Thank You....

Uda
 
T

Tom Grqyson

Jan 1, 1970
0
| Two lamps and a capacitor. And phasor diagrams! Most elegantly "Old
School."
|
| Oh that much else on the 'net was as well written.
|
| --s falke
|

I agree.

I was very impressed after my mind had already started thinking
about Zero crossing detectors and set / reset latches and such.

Makes me wonder if a design like this was planned from the start or
discovered by accident.

Tom Grayson
 
T

Tom Grqyson

Jan 1, 1970
0
||
| Another 'old school' is a tiny three-phase reluctance motor with three
test
| leads attached. It helps if you paint a disk or something on the shaft so
| you can easily hypnotize yourself ;-)
|
| daestrom
|
|

True, But I think the "Two lamps and a capacitor" wins "hands down"
on the grounds of simplicity and ease of construction.

but, to be fair, I have not seen the "Two lamps and a capacitor" work.
I do know the little motor leaves absolutely no doubt :eek:)


Tom
 
D

Don Kelly

Jan 1, 1970
0
Tom Grqyson said:
||
| Another 'old school' is a tiny three-phase reluctance motor with three
test
| leads attached. It helps if you paint a disk or something on the shaft so
| you can easily hypnotize yourself ;-)
|
| daestrom
|
|

True, But I think the "Two lamps and a capacitor" wins "hands down"
on the grounds of simplicity and ease of construction.

but, to be fair, I have not seen the "Two lamps and a capacitor" work.
I do know the little motor leaves absolutely no doubt :eek:)
Both work quite nicely:
The motor type was produced commercially - looked like an oversized hockey
puck with alittle window to view a rotating disc -probably was multipole and
low torque so the disc movement could be seen as other tha a blur. The
lamp/capacitor scheme also works nicely and is easy to build (and cheaper).
I remember these from about 50 years ago.
 
D

daestrom

Jan 1, 1970
0
Don Kelly said:
Both work quite nicely:
The motor type was produced commercially - looked like an oversized hockey
puck with alittle window to view a rotating disc -probably was multipole and
low torque so the disc movement could be seen as other tha a blur.

Yup. That's the type I was thinking of. Cut one open one time (it had
stopped working). Just a small set of coils on a small section of stator
iron (just a small arc of the complete circle). Gave it the 'effect' of
having multiple poles, just not a lot of torque (don't need it to spin the
disk).

daestrom
 
B

Ben Miller

Jan 1, 1970
0
s falke said:
Two lamps and a capacitor. And phasor diagrams! Most elegantly "Old
School."

It is still standard equipment for the utility meter guys around here. It
also serves as a work light in a dark vault!

Ben Miller
 
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